![]() ![]() A copy method is generated in the class.An unapply method is generated, which lets you use case classes in more ways in match expressions.Case class constructor parameters are public val fields by default, so the fields are immutable, and accessor methods are generated for each parameter.When the compiler sees the case keyword in front of a class it has these effects and benefits: Product TypesĪ product type is an algebraic data type (ADT) that only has one shape, for example a singleton object, represented in Scala by a case object or an immutable structure with accessible fields, represented by a case class.Ī case class has all of the functionality of a class, and also has additional features baked in that make them useful for functional programming. Later, when you want to create concrete implementations of attributes and behaviors, classes and objects can extend traits, mixing in as many traits as needed to achieve the desired behavior.Īs an example of how to use traits as interfaces, here are three traits that define well-organized and modular behaviors for animals like dogs and cats:Įnum Nat : case Zero case Succ ( pred : Nat )Įnums are covered in detail in the Domain Modeling section of this book, and in the Reference documentation. They provide a great way for you to organize behaviors into small, modular units. Scala traits can be used as simple interfaces, but they can also contain abstract and concrete methods and fields, and they can have parameters, just like classes. When writing code in an OOP style, your two main tools for data encapsulation are traits and classes. This section provides a quick overview of data modeling in OOP and FP. Scala supports both functional programming (FP) and object-oriented programming (OOP), as well as a fusion of the two paradigms. ![]() ![]() ![]() Info: JavaScript is currently disabled, code tabs will still work, ![]()
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